Help with AC Pressure Readings

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08-25-2016, 12:21 AM

MarkC

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Join Date: Jul 1998

Location: Hillsboro, OR, U.S.A.

Posts: 12

Help with AC Pressure Readings

Does someone know what engine RPM the published "A/C Performance Chart" is based on for taking refrigerant readings?

I think my AC is a bit low on refrigerant--as my air could be colder and my compressor seems to be cycling a bit much. I have a refrigerant manifold to perform a pressure test, and I found the specs for high and low pressure vs ambient temp...but in all my searches, I couldn't find what the appropriate RPMs are for the "A/C Performance Chart."

Thanks for any help...

'97 Camaro Z28

08-25-2016, 07:02 AM

GaryDoug

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Join Date: Jul 2010

Location: Born on the Florida West Coast, now where can I retire?

Posts: 1,505

Re: Help with AC Pressure Readings

It's at engine idle speed, but not specific. Another page says to have the engine idling for 20 minutes before starting diagnostics.

08-25-2016, 11:24 AM

MarkC

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Join Date: Jul 1998

Location: Hillsboro, OR, U.S.A.

Posts: 12

Re: Help with AC Pressure Readings

Perfect--just what I needed to know--Thanks!

08-25-2016, 11:51 AM

RiverMutant96

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Join Date: Oct 2011

Location: Central Wisconsin

Posts: 34

Re: Help with AC Pressure Readings

Yeah Marc,
I charged my 96 just last Sunday and with a 72 degree day, the pressure would be 35-45. I did also have the engine idling for about 10 minutes & kept the air on max cool. Now it seems to pumping real cold again!